Joint between two tubes of square or rectangular cross-section

ABSTRACT

In a joint between first and a second rectangular tube, the first tube has its end provided with anchoring means and inserted through an insertion opening in the front wall of the second tube. The anchoring means located within the second tube are embedded in the concrete filling the two tubes. The anchoring means consist i.a. of two wings which form extensions of the side walls of the second tube, and a tongue which forms an extension at the end of an intermediate wall, constituting an extension of one transverse wall of the second tube. This anchoring tongue lies along the rear wall or the second tube.

The present invention relates to a joint of the type described in thepreamble of the following main claim. An example of such a joint isdescribed in Swedish Lay-Open Print 8301953-9.

In the known joint, separate anchoring means are used, which can befixed to one of the tubes and inserted through an insertion opening inthe other tube to be embedded when the two tubes are filled withconcrete, particularly expanding concrete.

The object of the present invention is to make possible a simplified andthus cheaper manufacture of a tube provided with such anchoring means.This is achieved by a joint which in accordance with the invention hasthe characterizing features defined in the following main claim.

In manufacturing the first tube, which is to be provided with theanchoring means, this can be done simply by laser cutting and subsequentbending of the parts thus freed to positions disclosed in thecharacterizing clause of the main claim. Usually the first tube issubstantially narrower than the second tube, but within the scope of theinvention it is also possible to make a joint between two tubes ofessentially the same width. The tubes can form various desired angles toeach other within the scope of the invention.

Two simple embodiments of the joint according to the invention are shownas examples in the accompanying drawings.

FIG. 1 shows a first embodiment of a joint according to the invention insection along the line 1--1 in FIG. 2.

FIG. 2 is a section along the line 2--2 in FIG. 1.

FIG. 3 is a perspective view of one end of the first tube with theanchoring means.

FIG. 4 shows the cutting and bending of the parts of the tube end toform anchoring means.

FIG. 5 shows the first tube of a second embodiment of the invention in aperspective view.

FIG. 6 shows in section this first tube mounted in the second tube.

FIG. 1 shows a horizontal first tube 10 of rectangular cross-section,comprising two side walls 11,12 and two transverse walls 13,14 betweenthe edges of the side walls.

A second rectangular tube 10A has two side walls 15,16, a front wall 17and a rear wall 18. The front wall is provided with a rectangularinsertion opening 19 with lateral edges 20,21 and transverse edges22,23.

In the example shown, the joint is made so that the first tube 10 fitsrelatively snugly into the opening 19. Any play can be taken up by seals(not shown).

In the inserted position shown in FIG. 1, the first tube 10 has twoanchoring wings 11A,12A which are extensions of the side walls 11,12 andextend up to the vicinity of the rear wall 18.

The transverse walls 13,14 of the pipe extend up to the opening 19, andthere the transverse wall 13 continues at the opening with a tongue 13Awhich lies against the front wall 17 of the tube 10A and is fixed inthis position by means of a ring 24 around the tube 10A and over thetongue 24 to hold the tubes 10,10A in position when concrete is castinto the two tubes.

The second transverse wall 14 continues with an intermediate wall 14Awhich is bent in the vicinity of the rear wall 18 and extends with ananchoring tongue 14B along the rear wall 18.

In the intermediate wall 14A there is a flow-through opening 25, throughwhich concrete can flow when the two pipes are filled with concrete,thus embedding the anchoring means 11A,12A,14A,14B in cast concrete.

As is indicated in FIGS. 1 and 3, the intermediate wall 14A can beseparated from the wings 11A,12A by means of slits 26, these beingnecessary if the wings 11A,12A are to be closer to each other than thewidth between the walls 11,12. The tongues 13A,14B and the intermediatewall 14A should have a corresponding smaller width, which is the case ifthe tube 10 has the same width as the tube 10A. The two tubes 10,10A canbe identical. The opening 19 then takes up the entire internal widthbetween the side walls 15,16 of the tube 10A.

FIG. 4 shows how it is possible in a simple manner to achieve the tubeend shown in FIG. 3 using a tube 10 of rectangular cross-section. Slits27,28 are made in the side walls, e.g. using a laser. The slit 28 can beextended to form the slit 26. The transverse wall 13 is then cut at 29,and the tongue 13A is bent up. The side walls 11,12 are cut at 29A toleave the wings 11A,12A. The hole 25 has been made in the intermediatewall 14A. The tongue 14B is then bent downwards to the position for use.

In the example shown, the tube 10 forms a right angle with the tube 10A,but this angle can be selected as needed within the scope of theinvention. The tongues 13A,14B will then have correspondingly changedangles relative to the tube 10. The wings 11A,12A can also have othershapes than those shown.

In FIG. 1, the two tubes are filled with expanding concrete 30, in amanner known per se.

The second embodiment of the joint of the invention is shown in FIGS. 5and 6. A first tube 32 has its end connected to a second tube 33, bothtubes being of rectangular cross-section as in the embodiment shown inFIGS. 1 and 2.

The tube 33 has an insertion opening 34 for receiving the anchoring endof tube 32 so that it can be secured by being embedded in the concreteinjected.

The tube 32 has two side walls 35,36 and two transverse walls 37,38.

The tube 33 has two side walls 39, a front wall 40 and a rear wall 41.

At their ends the side walls 35,36 are extended with substantiallytriangular anchoring wings 35A,36A which have their narrow endspositioned adjacent to the rear wall 41.

The transverse walls 37,38 of the tube 32 extend to the opening 34, thetransverse wall 38 being extended with a tongue 38A lying against theouter side of the front wall 40 and held in place by means of the ring24.

The second transverse wall 37 is extended with an intermediate wall 37Apositioned between the upper edges of the anchoring wings 35A,36A. Atits end this wall is extended with a tongue 37B which is bent at anangle to the intermediate wall 37A and positioned along the wall 41.

At its end the tongue 37B is extended into a support wall 37C. This wallhas an oblique position and extends to transverse wall 37 where it isprovided with a foot 37D abutting the wall 40 above the upper edge ofthe opening 34.

In the intermediate wall 37A there is a flow-throw opening 37E, and inthe support wall 37C there is an opening 37F, both openings beingintended to facilitate distribution of the injected concrete to thespaces around the end of the tube 32 located in the tube 33.

The support wall 37C will reinforce the tongue 37B so that it willassist in maintaining the tube 37 in its predetermined position relativeto the tube 33. The foot 37D or the lower end of the support wall 37Crests against the front wall 40 and cooperates with the ring 24 securingthe tongue 34A to prevent the end of the tube 32 to leave itspredetermined position in the tube 33 when injecting concrete in the twotubes under relatively high pressure.

What is claimed is:
 1. Two tubes, said tubes being of square orrectangular cross-section, a first of said tubes having two spacedparallel side walls interconnected by two spaced parallel transversewalls, a second of said tubes having front and rear walls and aninsertion opening through said front wall, both of said tubes beingfilled with concrete, said first tube having an end extending throughsaid insertion opening into said second tube, said side walls of saidfirst tube terminating inside said second tube in two anchoring wings,one of said transverse walls terminating in a tongue which lies alongand is disposed outside of said front wall, the other transverse wallextending within said second tube toward and adjacent said rear wall ofsaid second tube and terminating in an anchoring tongue with a extendsalong said rear wall, that portion of said other transverse wall, whichis disposed within said second tube, having a flow-through hole for saidconcrete.
 2. Structure according to claim 1, in which said two tubes aredisposed at a right angle to each other.
 3. Structure according to claim1, in which said two anchoring wings are parallel to each other. 4.Structure according to claim 1, in which said other transverse wallwithin said second tube is integral with adjacent edges of said wings.5. Structure according to claim 1, in which said transverse wall withinsaid second tube is spaced from said wings.
 6. Structure according toclaim 1, in which the last-mentioned tongue terminates in a support wallthat extends obliquely toward said insertion opening.
 7. Structureaccording to claim 6, in which said support wall terminates in a footthat rests against an inner surface of said front wall.